python = set(["绮梦","冷伊一","香凝","梓轩"])
c = set(["冷伊一","零语","梓轩","圣博"])
print("选择python语言的学生有:",python)
print("选择C语言的学生有:",c)
print("交集运算：",python & c)
print("并集运算：",python | c)
print("差集运算：",python - c)